Abstract

Two-dimensional planar LiNbO3 (LN) crystal architectures are patterned on the surface of Li2O-Nb2O5-B2O3-SiO2 glass by continuous wave ytterbium YVO4 fiber laser (wavelength: 1080 nm) irradiations, in which lasers are scanned continuously with narrow steps (pitches: 0.3 and 0.5 μm) and thus with overlaps of laser irradiated parts. For the planar LN crystals (area: 50 μm × 100 μm) patterned by laser scanning with a power of 0.9 W and a speed of 7 μm/s, it is demonstrated from polarized micro-Raman scattering spectra and azimuthal dependence of second harmonic intensities that the c-axis orientation of LN crystals is established along the laser scanning direction. The present study proposes that the laser irradiation technique gives us uniform LN crystal films on the glass surface.

Figures (4)

(Color online) Polarized optical micrographs for the regions (area: 20 × 20 μm2) patterned by laser irradiations with different steps (pitches) of 2, 1, 0.5, and 0.3 μm between lines on the surface of the glass. The laser power and scanning speeds were fixed to 0.9 W and 7 μm/s, respectively, and laser irradiations were started from the point marked by the symbols of *.

(Color online) Polarization dependence in the optical microscope observations of the two-dimensional planar (50 × 100 μm2) architecture patterned by laser irradiations with the step of 0.5 μm on the glass surface. The configuration of micro Raman measurement is also shown.